Some of the nation’s largest airlines said Friday they raised fares by up to $10 per round trip, the first broad increase in three months. Sister airlines United and Continental raised prices on many U.S. routes by $4 to $10 ...

Southwest Airlines Co. has joined a sweeping increase of $10 in the price of many domestic round-trip airfares, citing the need to offset high fuel prices. Southwest’s action over the weekend may have ensured success for a price hike by ...